Battery issue

[irishmike]

So I replaced the battery again as it was reading low voltage and wouldn't keep a full charge.

Had another issue of not starting at a petrol station again this weekend. Did a scan and got the following, any ideas?

-------------------------------------------------------------
01 Engine Control Module 1

    System description: 4.2L V8/4V FSI ª
    Software version: 0090
    Hardware number: 8E1910560
    Long coding: 01040003180F0160

    Trouble codes: 
      P3088 - Starter relay Electrical error in circuit Upper limit exceeded
                  Intermittent
      P1923 - Check DTC memory of Engine Control Module (ECM) 2 Implausible signal
                  static

[PetrolDave]

DID you scan the other engine ECU at address 11 as well? That is referred to by the P1923 code.

[irishmike]

Yeah, this is what came up.

Engine Control Module 2

    System description: 4.2L V8/4V FSI ª
    Software version: 0090
    Hardware number: 8E1910560
    Long coding: 01040003180F0160

    Trouble codes: 
      P1411 - Bank 2, secondary air system Flow too Low Lower limit not reached
                  Intermittent
                  Measurements: -2199 U/min 16 % 58 km/h 36 °C 28 °C 1000 mbar 12.319 V 22.0 °v.OT
                  Frequency counter: 3
                  Mileage: 131525 km
                  Driving cycle: 255
                  Priority: 0

[PetrolDave]

Both are intermittent, have you tried clearing them and seeing if they return?

The P3088 suggests if they return that it could be the (very common) relays underneath the ECU problem.

[irishmike]

Yeah have cleared them previously and the above one does occasionally return, the other starter one crops up more often.